Description: Material: Bike Water Bottle Holder is made of carbon fiber material, which is lighter than aluminum alloy, harder than plastic, no rot, no deformation, high temperature resistance, friction resistance, corrosion resistance. Suitable for most bikes. only 1 oz/29 g. Dimensions: Bicycle Water Bottle Cage is suitable for bottles with a diameter of about 74mm/ 2.9in. Features: Unique design, no matter riding on the road or rough terrain, can hold the bottle tightly, will not shake and fall off, will not deform or break when encountering strong impact, one handed operation is also very convenient to take out and put in the water bottle. Mounting: Fits on most bikes, comes with 4 bolts and a wrench for easy and quick mounting to your bike frame. Stay hydrated on your ride: quick and easy access to your bike water bottle when you need it. Great for road, mountain, hybrid, touring, and electric bikes. Specification: Material: carbon fiber Size Chart: 15x8cm/5.91x3.15inch Package Includes: 1 Piece Bike Water Bottle Holder(2 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!